銀座Rails版「点字メーカープログラム」の提出

lib/tenji_maker.rb

@@ -1,43 +1,39 @@
+# frozen_string_literal: true
+
 class TenjiMaker
+  REGULAR_ARRANGEMENTS_OF_DOTS = {
+    A: '1', I: '12', U: '14', E: '124', O: '24',
+    K: '6', S: '56', T: '35', N: '3', H: '36', M: '356', R: '5'
+  }.transform_keys(&:to_s).freeze
+
+  IRREGULAR_ARRANGEMENTS_OF_DOTS = {
+    YA: '34', YU: '346', YO: '345', WA: '3', N: '356'
+  }.transform_keys(&:to_s).freeze
+
   def to_tenji(text)
-    # 以下はサンプルの仮実装なので、このcase文は全部消して自作ロジックに書き直すこと
-    case text
-    when 'A HI RU'
-      <<~TENJI.chomp
-        o- o- oo
-        -- o- -o
-        -- oo --
-      TENJI
-    when 'KI RI N'
-      <<~TENJI.chomp
-        o- o- --
-        o- oo -o
-        -o -- oo
-      TENJI
-    when 'SI MA U MA'
-      <<~TENJI.chomp
-        o- o- oo o-
-        oo -o -- -o
-        -o oo -- oo
-      TENJI
-    when 'NI WA TO RI'
-      <<~TENJI.chomp
-        o- -- -o o-
-        o- -- oo oo
-        o- o- o- --
-      TENJI
-    when 'HI YO KO'
-      <<~TENJI.chomp
-        o- -o -o
-        o- -o o-
-        oo o- -o
-      TENJI
-    when 'KI TU NE'
-      <<~TENJI.chomp
-        o- oo oo
-        o- -o o-
-        -o o- o-
-      TENJI
+    romanized_letters = text.split("\s")
+    tenjis_rows =
+      romanized_letters.map do |letter|
+        arrangement = to_arrangement(letter)
+        dots = create_dots(arrangement)
+        dots.each_slice(3).to_a.transpose.map(&:join)
+      end
+    tenji_lines = tenjis_rows.transpose.map { _1.join("\s") }
+    tenji_lines.join("\n")
+  end
+
+  def to_arrangement(letter)
+    if (arrangement = IRREGULAR_ARRANGEMENTS_OF_DOTS[letter])
+      arrangement
+    else
+      arrangements = letter.each_char.map { REGULAR_ARRANGEMENTS_OF_DOTS[_1] }
+      arrangements.join.squeeze
+    end
+  end
+
+  def create_dots(arrangement)
+    (1..6).map do |number|
+      arrangement.include?(number.to_s) ? 'o' : '-'
     end
   end
 end